Mixed Reactor for Reactions in Liquid Media

1 Mechanically Mixed Reactor for Reactions in Liquid Media 

The physical model of the reactor is a 350 mm high cylindrical vessel, with a diameter of 200 mm and an elliptical bottom. The operation volume is V = 12 10 m. The entrance of the reactants is placed near the middle of the reactor, more exactly at 130 mm from the bottom. The reactor s exit is positioned on the top of the vessel but below the liquid level. At the vessel centre is placed a mixer with three helicoidal paddles with d/D = 0.33. It operates with a rotation speed of 150 mirnf In order to establish the reactor flow model, this is filled with pure water which continuously flushes through the reactor at a flow rate of 6.6 10 5 m /s (similar to the reactants flow rate). At time t = 0, a unitary impulse of an NaCl solution with a Cq = 3.6 kg/m is introduced into the reactor input. The time evolution of the NaCl concentration at the exit flow of the reactor is measured by the conductivity. Table 3.5 gives the data that show the evolution of this concentration at the reactor exit. 

The proposal of an adequate flow model of the reactor and the identification of the parameters are the main requirements of this application. Solving this type of problem involves two distinct actions first the selection of the flow model and second the computations involved in identifying the parameters. 

The computations to identify the parameters are given algorithmically, step by step, by the procedure below  

C(9j) = c(9j)/co.Table 3.6 presents this dependence. Here dj values are also computed as ln(l — c(9j)/cq) because they are needed for the flow model equation (3.121). 

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